Worm shoe

A worm shoe is a strip of wood such as oak or pine which is fixed to the keel of a wooden boat to protect it from shipworms.

The wood is sacrificed to the worms while the main structure is kept separate and safe using a layer of tar paper or creosoted felt, which the worms will not penetrate.

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The hull of schooner Lettie G. Howard with its keel, false keel and worm shoe